Paper-pulp mill.



A. P. & O. B. BAHR.

PAPER PULP MILL.

APPLICATION FILED AUG. 23. 1909.

Patented Jan. 18, 1910.

2 SHEETS-SHEET 2.

WITNESSES:

W fix ATTORNEY A. F. & O. B. BAHR.

PAPER PULP MILL.

APPLICATION FILED AUG. 28. 1909.

III/

WITNESSES INVENTORS.

ATTORNEY AMEL F. BAHR AND OTTO 3. BABE, OF MARION; INDIANA.

PAPER-PULP MILL.

Specification of Letters latent.

Patented Jan. 18, 1910.

Application filed August 23, 1909. Serial 110.514326.

To all whom 'it may concern:

Be it known that we, AMEL Fl BAHR and O'r'ro l3. BAHR, citizens of the United States, residing at Marion, in the county of Grant and State of Indiana, have invented certain new and useful Improvements in Paper- Pulp Mills, of which the following is a specification, reference being had therein to the accompanying drawing.

Our invention relates to improvements in paper pulp mills hereinafter described in thisspecification and particularly pointed out in the claim.

Heretofore paper pulp mills have been constructed with shells built up of Wood sections in the form of a hollow truncated cone in or between each section of which were secured stationary knives which proj ected radially inwardly from the inner surface of the shell. This. shell deteriorated under the action of the moisture of the pulp passing through the mill, and it became necessary at times to replace the shell with a new shell which was built up in the casing of the mill which was anexpensive operation and necessitated skilled labor and experience in this'class of work to make the repair or renewal.

- The object of this invention is to provide a removable metallic shell for paper pulp mills that will'be' to a great degree impervious to moisture and the acidulated fluid in the pulp mixture passing through the mill and that may be keyed'and expanded to be secured in position in the interior of the mill, and also, to provide a simple means for expanding the sections of which the shell is composed separately and independently of each other to secure them in their fixed positions in the casing, also, to construct the internal grinding teeth of the shell integral with the shell. "We attain these objects by means of the invention illustrated in the accompanying drawings in which like numer als of references designate like parts throughout the several views. J

Figure'l. is a longitudinal sectional elevation of the mill taken along the line 1-1 in Fig. 2; Fig. 2. is a transverse sectional elevation of the same taken along the line 2-2 in Fig. 1; Fig. 3. is an enlarged detail transverse section of the guide bars of the sliding bearing taken along the line 3 in Fig. 1; Fig. 4. is a detail side elevation of the revolving center or plug of the mill; Fig. 5. is an end elevation of the larger end of the revolving center or plug of the mill; Fig. 6. is a. similar View of the smaller end. of the revolving center or plug of the mill; Fig. 7. is an enlarged detail side elevation of the exterior of the shell; Fig. 8. is a development or envelop of a. portion of one of the sections of the shell showing the arrangement of the interior teeth thereof; and Fig. 9. is a section of the same taken along the line 9 9 in Fig. '8. I

The outer casing 1 of the mill is formed like a hollow truncated cone and is preferably constructed of cast iron with its larger end open and its smaller end closed by the integral cover portion 2. The larger open end portion of the casing 1 is provided with a. removable cover 3 which is fitted 'to the face of the flange portion 4 to form a close joint, and to said flange portion is securely bolted the cover portion 3 by the bolts 5 so as to be removable.

Centrally on the integral end cover 2 and the removable cover 3 are formed the shaft bearings 6 and 7 which are bored to receive the packing glands 8 whereby the joints between the said bearings and the peripheral surface of the shaft .10, are rendered water tight. The casing 1 is provided with the feet 9 whereby it is supported in horizontal position. The ends of the shaft 10 are prolonged to project beyond the glands 8. The prolonged end of the shaft 10 proguide bars 17 The ends of the guide bars 17 are provided with the integral feet 18 which are fitted and securely bolted in position to the cover 3.- The cross-bar 19 is formed integral with the guide bars 17 and is bored and threaded to. receive the screw The revolving center orplug is composed.

of the centers or end spiders 21 and 22 which are keyed or otherwise secured 111 'jecting from the smaller closed end of the position on the shaft 10 to turn with the latter, and the staves 23 which are built up around the peripheries of the centers 21 and 22 and secured thereto after which said center is turned truly on its outer periphery to reduce the staves to a true conical surface, and set in between saidstaves 23 and secured in position at their proper distances apart are the longitudinally extending knives 24, see particularly Figs: 3, 4, and 5.

The knives 24 project beyond the outer peripheral surface of the revolving center or plug, so as to cooperate with the kniyes or teeth 29 of the stationary shell.

The stationary or non-revoluble shell is constructed of a metal, preferably an alloy composed of manganese, pig iron and steel, and may be divided into three sections or parts, and consists of the end' sections 25 and 26 and the intermediate section 27, each of which sections is constructed in the form of a'truncated cone or is tapered on its exterior surface to fit into the interior bore of the casing 1 and each of said sections is divided or split longitudinally at one side and between these divided portions is driven an expanding key 28 whereby the sections each are expanded in the casing 1 to be tightly held in position therein to be prevented from turning with the revolving center or plug as it is revolved.

Each section of the shell is provided with teeth or knives 29, which are formed integral with the body portions 25, 26 and 27 of the shell and said teeth or knives cooperate with the teeth 24 of the revolving center or plug to reduce the paper pulp intothe finely divided state required in paper manufacture. The teeth or knives 29 of the shell are inclined to the direction of the axis of the shell or are arranged to extend helically, as shown in the developed view of a section in Fig. 8.

Each of the shell sections 25, 26 and 27 is provided with steadying bolts 29, which are situated diametrically opposite the key or slit and the said bolts are provided for the purpose of holding the sections in position in the casing 1 while driving the keys 28 home to expand-the sections in the casing -1 to snugly fit therein.

lhe shaft 10 and the revolving plug or center are moved longitudinally by the screw 20 when it is necessary to move the cutting edges of the knives 24 nearer to the cutting edges of. the teeth or knives 29 to. adjust the mill to reduce the pulp to a required degree of fineness, or when it is necessary to adjust the knives on account of wear. The shaft 10 on which the revolving center or plug is mounted is driven by the belt pulleyT 1310. h

e inlet pipe 31 supplies t e pa er ulp to the mill to be reduced to the l'iiiely divided state and the outlet pipe 32 carries the reduced paper pulp that has passedthrough and undergone the operation of reduction or grinding from the mill. On the end portion of the screw 20 is secured a hand-wheel 33 whereby the screw 20 is revolved to move the bearing 15 when adjusting the knives 24 in position relatively to the knives 29.

We claim In a paper pulp mill, the combination with an outer conical casing having a smaller closed end and a larger open end, a removable cover on said open end, a conical revolving center or plug situated centrally and extending longltudinally in said casing, longitudinally extending knives projecting from the peripheral surface of the said revolving center or plug, of a shell composed of a plurality of sections of a truncated cone form and each section composed of an integral piece of metal and each section provided with a longitudinally extending peripheral dividing slit, keys fitted into each'slit of said sections, whereby said sections are independently expanded to fit tightly insaid outer casing, integral teeth rojecting from the interior peri heral surface of said shell, and anchor bo ts'passing through said shell and said casing, whereby said shells are held iii their relative posltions in said casing.

In testimony whereof we alfix our signatures in presence of two witnesses.

AMEL F. BAHR.

OTTO B. BAHE.

Witnesses: THOMPSON R. BELL, THOMAS COLSQN. 

